Stabilization of tetra alkyl lead and composition containing the same



Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE WILLIAM S. CALCOTT, OF PENNS GROVE, AND ALFRED E. PARMELEE, OF CARNEYS POINT,

NEW JERSEY, ASSIGNORS TO E. I. DU PONT DE NEMOURS & COMPANY, OF WILMING- TON, DELAWARE, A CORPORATION OF DELAWARE STABILIZATION OF TETRA ALKYL LEAD AND COMPOSITION CONTAINING THE SAME No Drawing.

This invention relates to the stabilization of tetra alkyl lead, unmixed with anything but its normal impurities, and more particularly to the stabilization of tetra. alkyl lead and compositions containing tetra alkyl lead by the addition thereto of small amounts of certain aliphatic amines not heretofore proposed for this purpose.

It is known that ordinarily commercial tetra alkyl lead, particularly tetra ethyl lead, decomposes slowly on standing, with the formation of a precipitate, and that this decomposition is accelerated in these compounds when they contain such organic substances as halogen derivatives of hydrocarbons.

In our U. S. Patent 1,724,640, we have dis closed a composition comprising tetra alkyl lead and certain aliphatic bases including the, alkyl substituted hydroxy amines.

lVe also found that decomposition of tetra alkyl lead compounds, and compositions containing the same, can be prevented by the introduction into these compounds or compositions, of hydroxyl substituted alkyl amines, such for example as aliphatic primary, secondary, or tertiary amines, or derivatives of these, such as the tetra alkyl ammonium hydroxides, and alkylol amines.

Other compounds which may be used comprise butylamines, including the normal and iso-eompounds, the di-butylamines and tributylamines, the ethanolamines, the propyland iso'propyl-amines, the amylamines, the benzylamines, and the mono-, di-, and triethylamines. Also, mixtures of any two or more of these compounds may be used;

By way of description of our invention, the following illustrative examples, are given. but it will be understood that other embodiments exist and may be practiced without departing from the spirit of the in vention:

Example 1 To 100 grams of tetra ethyl lead isadded,--.

Application filed. January 10, 1931. Serial No. 507,990.

Example 2 100 grams of tetra ethyl lead, 90 grams of ethylene dibromide, 10 grams of mono-chlornapthalene and 0.4 gram of a mixture consisting mainly of triand di-ethanol amine are mixed together.

Example 3 50 grams of tetra methyl lead, grams of ethylene dibromide, and 5 grams of monochlor-napthalene are mixed together. To this mixture is added methanolamine, either anhydrous or as water solution, in amounts up to one gram.

Ear/ample 4 grams of tetra ethyl lead, 45 grams of ethylene dibromide, and 5 grams of monochlor-napthalene are mixed together. To this mixture is added tetra-ethyl-ammonium hydroxide, either anhydrous or as water solution, in amounts up to one gram.

Example 5 50 grams of tetra ethyl lead, 45 grams of ethylene dibromide, and ,5 grams of monochlor-napthalene are mixed together. To this mixture is added ethanolamine, either anhydrous or as water solution, in amounts up to one gram.

The solutions prepared according to the foregoing illustrative'examples will remain stable indefinitely under the conditions ordinarily employed for the storage of tetra ethyl lead and mixtures containing the same.

It will be understood, of course, that either tetra ethyl lead or tetra methyl lead may be included in any one of the foregoing illustrative examples. We have found that these solutions so prepared will remain stable indefinitely under the conditions ordinarily employed for the storage of tetra alkyl lead compounds and the compositions containing these compounds.

As many apparently Widely different em bodiments of this invention may be made without" departing from the spirit thereof, it is to be understood that we do not intend to limit ourselves to the specific embodiments thereof except as indicated in the appended claims.

We claim:

1. A composition comprising tetra alkyl lead and an alkylol amine.

2. A composition comprising tetra ethyl lead and an a 101 amine.

3. A composltion comprising tetra ethyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon and an alkylol amine.

4. A composition comprising tetra ethyl lead, ethylene dibromide, a chlor-naphthalene, and an alkylol amine.

5. A composition comprising tetra ethyl lead, ethylene dibromide, mono-chlor-naphthalene, and an alhylol amine.

6. A composition comprising tetra alkyl lead and ethanol amine.

7. A composition comprising tetra alkyl lead and a mixture of ethanol amines containing triethanol amine.

8. A composition comprising tetra alkyl lead, an alkyl bromide, and ethanol amine.

9. A composition comprising tetra alkyl lead, an alkyl bromide, and a mixture of ethanol amines containing triethanol amine.

10. A composition comprising tetra alkyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon, and ethanol amine.

11. A composition comprising tetra alkyl lead, ethylene dibromide, a chlorinated aromatic hydrocarbon, and a mixture of ethanol amines containing triethanol amine.

12. A composition comprising tetra ethyl lead, ethylene dibromide, a chlor-naphthalene, and ethanol amine.

13. A composition comprising tetra ethyl lead, ethylene dibromide, a chlor-naphthalene, and a mixture of ethanol amines containing triethanol amine.

l. A composition comprising tetra ethyl lead, ethylene dibromide, mono-chlor-naphthalene, and ethanol amine. 1

15. A composition. comprising tetra eth 1 lead, ethylene dibromide, mono-chlor-nap thalene, and a mixture of ethanol amines containing triethanol amines. 1

In testimony whereof we afiixour' signatores.

- WILLIAM S. CALCOTT.

ALFRED E. 

